What is a photoconductor?
Photoconductors function by absorbing a photon that has energy greater than that of the bandgap energy of the semiconductor material. The energy of the photon breaks a bond and lifts an electron into the conduction band creating an electron/hole pair that can migrate through the material and conduct a measurable electric current. IR Labs offers photoconductors made of either Boron doped Silicon or Gallium doped Germanium. These detectors cover the spectral range between 5-30um and 40-120um, respectively.
Cooled using liquid cryogens or mechanical refrigeration.
Photoconductors are cooled to cryogenic temperatures using pour-filled liquid cryogen dewars or cryogen-free mechanical refrigeration. Liquid cryogen coolers are compact with no moving parts, easy to use, have a lower initial cost, and recommended for simple, reliable operation. Refrigerated systems are larger, more complex, and have a higher initial cost but eliminate the expense of refilling cryogens. Cryo-free cooling is recommended for cost-effective, continuous unattended cold operation: